Crawford, William <br/><br/>
The keepers of light :  a history and working guide to early photographic processes  Vol.1: 

 - Dobbs Ferry :  Morgan & Morgan,  1979. 
 - 121 p. 
<br/><br/>Indice 
<br/><br/><label>Subjects--Chronological Terms: </label><br/>SECULO 19 
<br/><br/><label>Subjects--Topical Terms: </label><br/>FOTOGRAFIA<br/>PROCESSO FOTOGRAFICO<br/>PROCESSO HISTORICO
<br/><br/><label>Index Terms--Genre/Form: </label><br/>HISTORIA<br/>TECNICA